Machine for separating flour



. 3 Sheets--Sheet l. W. G. BOORMAN 8a E. J. DONOHUE. MACHINE FORSEPARATING FLOUR.

Patented Nov. 11, 1'800.

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MACHINE FOR SBPARATING FLOUB..

Patented Nov. 11, 1890.

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W. G. BOORMAN 8v E. J. DONOHUE.

MACHINE PGR SEPARATING PLUUR.

No. 440,301. Patented Nov. 11, 1890.

UNITED STATES PATENT 'Erica VILLIAM G. BOORMAN AND EDWARD J. DONOHUE, OFMAUSTON, VISCONSIN.

MACHINE FOR SEPARATING FLOUR.

SPECIFICATION forming part of Letters Patent No. 440,301, dated November11,1890.

- Application filed October 3, 1889. Serial No. 325.872. (No model.)

To all whom it may concern.-

Be it known that we, WILLIAM G. Boon- MAN and EDWARD J. DoNoHUE,citizens of the United States, residing at Maust-on, in the county ofJuneau and State of Wisconsin, have invented new and useful Improvementsin Machines for Separating Flour, rbc., of which the following-is aspeciiication.

This invention relates to that class of separating-machines which areprovided with shaking screens. Our invention is more particularlydesigned to produce an efficient separating-machine for separating thebreaks from roller-mills, which operation is commonly known as scalping,although Inachines containing my present improvements may be employedfor separating other' products or substances in the manufacture of fiourand in other industrial operations.

' The object of our invention is to provide means for shaking orvibrating the separating-screen in a peculiar manner, so that a thoroughseparation is effected, and to provide the screen with efficient meansfor keeping the meshes of the cloth clean.

The invention consists of the improvements which will be hereinaftermore fully set forth, and pointed out in the claims.

In the accompanying drawings, consisting of three sheets, Figure l is aside elevation, partly in section, of our improved bolting-m achine.Fig. 2 is a fragmentary cross-section of the same in line Fig. l. Fig. 3is a longitudinal section, on an enlarged scale, of the tail portion ofthe separator. Fig. 4 is a horizontal section of the separating-screen,looking upwardly, in line y y, Fig. l. Fig. 5 is a fragmentary verticalcross-section of the separator, on an enlarged scale, in line x Qc',Fig. 3. Fig. 6 is a fragmentary perspective view of theseparating-screens. Fig. 7 is a fragmentary bottom plan view of one ofthe screen-cloths on an enlarged scale. Fig. S is fragmentarylongitudinal section of one of the screen-cloths on an enlarged scale.Fig. 9 is a similar view showing a modified attachment of the vibratingrod to the screencloth. Fig. 10 is a view of a modified construction ofthe adj ust-able stop.

Like letters of reference refer to like parts in the several figures.

A represents the stationary main frame of the machine, and a thefeed-hopper secured to the upper portion thereof near one end.

represents the inclined shaking shoe orv frame in which theseparating-screens are mounted, and which is yieldingly supported in thestationary frame A. As shown in the drawings, the shoe B is supported onthe inclined longitudinal pieces a of the main frame by four springs c,one near each corner of the shoe. These springs rest upon supports c',having studs which enter the cavities of the springs, anddownwardly-extending screw-bolts c2, which pass through holes in thelongitudinal pieces a. The screwbolts are secured in the longitudinalpieces 'by jam-nuts c3, resting on these pieces, and screw-nuts c4,bearing against the under sides of said pieces, as represented in Fig. 5of the drawings, whereby the spring-supports can be vertically adjusted.As each springsupport is independently adjustable, the shaking-shoe canbe adjusted at each corner, as may be necessary, to cause an evendistribution of the material over the screen. The shaking-shoe restsupon these springs by brackets d, which are secured to the sides of theshoe and provided with downwardly-projecting studs, which enter theupper ends of the springs.

E represents rotating cams arranged above the shaking-shoe and operatingto depress the same and compress the springs on which the shoe rests.These cams are mounted upon two transverse horizontal shafts c e', whichare journaled in the main frame, one shaft c being arranged near thehead of the shoe and the other c near the tail thereof. The head-shaft eis provided with a drivingpulley e2. These two transverse shafts aregeared together so as to rotate exactly in unison by an inclinedlongitudinal shaft f, which is connected with the shafts by bevel-wheelsf f and f2f2. This longitudinal shaft and the connecting-gears form apositive connection between vthe two shafts, whereby one shaft isrotated from the other and both are rotated exactly alike, so that thecams will vibrate the shoe at the four corners at exactly the same time,thereby preventing any uneven or irregular movement and twisting of IOOthe screen. The cams E are-represented in the drawings as beingfour-sided, but may be of any other suitable form.

G represents stops, which are secured to the main frame and projectbeyond the retreating portions of the cams, so as to limit the upward orreturn movement of the shoe. When the latter is in its highest position,it bears against these stops, as represented in Fig. 3, and does nottouch the cams, but is held at a short distance behind the cams. Thecams are thereby caused to strike the shoe with a forcible blow at thebeginning of each downward movement of the shoe, The stops also causethe shoe to come to a sudden stop at the end of each upward movement, sothat the downward movement is started suddenly or with a forcible blowand the upward movement is arrested in like manner, causing the shoe toreceive two sharp blows at each complete movement. These stops preventthe shoe from following the cams from end to end of their movement,whereby a gradual beginning and ending of the movement would beproduced, but cause a movement of the shoe which begins and ends with asudden jar or hammer action, similar to that of a knocker. The jarproduced by the stops occurs midway between two successive jars producedby the cams, so that the stops double the jarring action which isimparted to the shoe. These stops may be composed of screw-rods g, whichare attached to brackets g', secured to the main frame A, and in whichthey can be adjusted toward and from the shaking-shoe, as represented inFigs. 3 and 5. They may also be formed by eccentrics h, which aresecured to the main frame by screws h', on which the eccentrics can beturned for adjusting them when the screws are loosened, and which aresecured in position by tightening the screws, as represented in Fig. l0.Any other suitable construction of stop may, however, be employed, ifdesired. By adjusting these stops the throw of the shaking-shoe can beincreased or reduced, as may be necessary. The sharp jar produced by thestops aids materially in keeping the meshes of the screen clear. y

H H H2 represent three screens arranged in the shoe B one below theother, the top screen H being the coarsest and the bottom screen H2 thefinest in mesh, as represented in Fig. 3. h2 represents vibrating rods,which are applied to the under sides of the screencloths of the upperscreens H and H for the purpose of transmitting the vibrations from theshoe or frame to the cloth. These rods are thin flexible rods or tubes,preferably of metal, which are secured with their ends to thescreen-frame and extend across the screencloth on the underside thereof.The cloth is preferably provided with a re-enforcing strip 'L' ofticking or other strong material, by which the cloth rests on the rodand which prevents wear ofthe cloth. The cloth is connected with the-rod by ringsj, whichare attached to the re-enforcing strip and throughwhich the rod passes, as represented in Figs. 4, 6, 7, and 8, or by atubular portion or sleeve lo, formed on the re-enforcing strip t, asrepre` sented in Fig. 9, or in any other suitable manner. The vibrationswhich are imparted to the sieve-frame and communicated by the latter tothe cloth diminish in force in the cloth from the frame inwardly, sothat the vibrations lose a large portion of their force in the centralportion of the cloth, and are extinguished altogether when the cloth hasbecome loose or baggy. For this reason the cloth is kept comparativelyclear near the screen-frame, but fills up in the middle of the screen,whereby the separating'action is impaired. The iiexible rods receive thevibrations from the frame, and these vibrations increase in size,number, and force from both ends of each rod inwardly, as the innerportion of each rod is least supported. These rods transmit thevibrations to the cloth which rests on them and cause a. thoroughagitation of the middle portion of the cloth, whereby the latter isprevented from filling up, and all portions of the screen-cloth are keptin proper condition for effecting the desired separation, while thematerial is prevented from accumulating in a thick layer upon lthemiddle of the cloth. The rods lift the clothv during their upwardmovement and pull it down by means of the rings or sleeves during theirdownward movement.

The lower screen H2 may be kept clear by a traveling brush L, operatedby an endless IOO belt or chain Z, or by means of rods and rings similarto the screens H H', as shown in Fig. 6, or in any other suitablemanner. The screens H H H2 are arranged so closely together in the shoethat the middlings or other substances passing over the second and thirdscreens H and H2 are thrown upwardlyfrom each of these screens againstthe lower surface of the next higher screen, so that the meshes of theupper screens are also kept clear by the impact of the material againsttheir lower sides. Y

The tailings from the several screens pass into discharge-spouts M M.M2, while the material which passes through the lower screen passes intoone or more hoppers N.

We claim as our inventionl. The combination, with the inclinedseparating-screen, of independently adjustable springs, upon which thescreen rests near its four corners, and rotating cams arranged above thescreen near its fourcorners, whereby the screen is depressed again stsaid springs, substantially as set forth.

2. The combination, with the inclined separating-screen, ofindependentlyadjustable springs, on which the screen rests near its fourcorners, rotating cams arranged above the screen near its four corners,whereby the screen is depressed against said springs, and

IIO

stops separate from v the cams by which the upward movement of thescreen is arrested, substantially as set forth.

3. The combination, with the stationary main frame, of an inclinedscreen-frame, transverse shafts arranged over the screenfranie, camsmounted on said shafts and moving the screen-frame downwardly, alongitudinal shaft and gear-wheels connecting said transverse shaft, andindependently-adj ustable springs by which the screen-frame is movedupwardly, substantially as set forth.

4. Thecombination, with the screen-frame and the screen-cloth securedthereto, of a ilexible rod secured t0 the screen-frame, and fastenin gsconnecting the cloth with the exible rod, whereby the cloth is compelledto ber, 1889.

WILLIAM G. BOORMAN. EDWARD J. DONOHUE. Witnesses:

G. H. WINsoR, F. WINsoR.

